This is my first dev diary post. I'm hoping to do this on a semi-regular basis. Over the last few weeks I've been working on the targeting system. This game is built using my own engine so it was a case of experimenting, failing and then finally settling on a simple and extensible design for weapons, associated explosions and a simple hand written collision detection system. I wanted to be able to create a new weapon type in a few lines of code, a corresponding explosion animation and custom weapon and explosion sounds. In addition I wanted to be able to register a collideable thing with the collision system. The collision system in effect then sits in-between the weapon systems and collideable objects. It performs collision detection and manages the notification of collisions to interested observers. A short video of it in action is here If you want to know more about the design and / or have any suggestions for improvement let me know! Thanks, Ben.